Corn dogs didn't come into existence
till the first half of the 20th CENTURY.
The Big Bang Theory Season 2, Episode 2
Thailand has had the fork
since the latter half of the 19th CENTURY.
The Big Bang Theory Season 1, Episode 2
It's the 21st CENTURY.
The Big Bang Theory Season 5, Episode 17
of 17th CENTURY philosopher
René Descartes.
The Big Bang Theory Season 12, Episode 10
Because one of the great minds
of the 21 st CENTURY...
The Big Bang Theory Season 1, Episode 4